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/*

 * Copyright (c) 2005 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup ia64

 * @{

 */

/** @file

 */

#include <arch/drivers/ski.h>

#include <console/console.h>

#include <console/chardev.h>

#include <sysinfo/sysinfo.h>

#include <arch/types.h>

#include <proc/thread.h>

#include <synch/spinlock.h>

#include <arch/asm.h>

#include <arch/drivers/kbd.h>

#include <string.h>

#include <arch.h>

enum {

    /** Interval between polling in microseconds */

    POLL_INTERVAL =  10000,  /* 0.01 s */

    /** Max. number of characters to pull out at a time */

    POLL_LIMIT    =     30,

    SKI_INIT_CONSOLE  = 20,

    SKI_GETCHAR       = 21,

    SKI_PUTCHAR       = 31

};

static void ski_putchar(outdev_t *, const wchar_t, bool);

static outdev_operations_t skiout_ops = {

    .write = ski_putchar

};

static outdev_t skiout;            /**< Ski output device. */

static bool initialized = false;

static bool kbd_disabled = false;

/** Initialize debug console

 *

 * Issue SSC (Simulator System Call) to

 * to open debug console.

 *

 */

static void ski_init(void)

{

    if (initialized)

        return;

    asm volatile (

        "mov r15 = %0\n"

        "break 0x80000\n"

        :

        : "i" (SKI_INIT_CONSOLE)

        : "r15", "r8"

    );

    initialized = true;

}

static void ski_do_putchar(const wchar_t ch)

{

    asm volatile (

        "mov r15 = %[cmd]\n"

        "mov r32 = %[ch]\n"   /* r32 is in0 */

        "break 0x80000\n"     /* modifies r8 */

        :

        : [cmd] "i" (SKI_PUTCHAR), [ch] "r" (ch)

        : "r15", "in0", "r8"

    );

}

/** Display character on debug console

 *

 * Use SSC (Simulator System Call) to

 * display character on debug console.

 *

 * @param dev    Character device.

 * @param ch     Character to be printed.

 * @param silent Whether the output should be silenced.

 *

 */

static void ski_putchar(outdev_t *dev, const wchar_t ch, bool silent)

{

    if (!silent) {

        if (ascii_check(ch)) {

            if (ch == '\n')

                ski_do_putchar('\r');

            ski_do_putchar(ch);

        } else

            ski_do_putchar(U_SPECIAL);

    }

}

void skiout_init(void)

{

    ski_init();

    outdev_initialize("skiout", &skiout, &skiout_ops);

    stdout = &skiout;

    sysinfo_set_item_val("fb", NULL, false);

}

/** Ask debug console if a key was pressed.

 *

 * Use SSC (Simulator System Call) to

 * get character from debug console.

 *

 * This call is non-blocking.

 *

 * @return ASCII code of pressed key or 0 if no key pressed.

 *

 */

static wchar_t ski_getchar(void)

{

    uint64_t ch;

    asm volatile (

        "mov r15 = %1\n"

        "break 0x80000;;\n"  /* modifies r8 */

        "mov %0 = r8;;\n"

        : "=r" (ch)

        : "i" (SKI_GETCHAR)

        : "r15", "r8"

    );

    return (wchar_t) ch;

}

/** Ask keyboard if a key was pressed.

 *

 * If so, it will repeat and pull up to POLL_LIMIT characters.

 */

static void poll_keyboard(ski_instance_t *instance)

{

    wchar_t ch;

    int count;

    if (kbd_disabled)

        return;

    count = POLL_LIMIT;

    while (count > 0) {

        ch = ski_getchar();

        if (ch == '\0')

            break;

        indev_push_character(instance->srlnin, ch);

        --count;

    }

}

/** Kernel thread for polling keyboard. */

static void kskipoll(void *arg)

{

    ski_instance_t *instance = (ski_instance_t *) arg;

    while (true) {

        if (!silent)

            poll_keyboard(instance);

        thread_usleep(POLL_INTERVAL);

    }

}

ski_instance_t *skiin_init(void)

{

    ski_init();

    ski_instance_t *instance =

        malloc(sizeof(ski_instance_t), FRAME_ATOMIC);

    if (instance) {

        instance->thread = thread_create(kskipoll, instance, TASK, 0,

            "kskipoll", true);

        if (!instance->thread) {

            free(instance);

            return NULL;

        }

        instance->srlnin = NULL;

    }

    return instance;

}

void skiin_wire(ski_instance_t *instance, indev_t *srlnin)

{

    ASSERT(instance);

    ASSERT(srlnin);

    instance->srlnin = srlnin;

    thread_ready(instance->thread);

    sysinfo_set_item_val("kbd", NULL, true);

    sysinfo_set_item_val("kbd.type", NULL, KBD_SKI);

}

void ski_kbd_grab(void)

{

    kbd_disabled = false;

}

void ski_kbd_release(void)

{

    kbd_disabled = true;

}

/** @}

 */